title: Fluorescence of harmol, harmalol and 2-hydroxycarbazole in concentrated hydroxide solutions.
abstract: Room temperature electronic absorption and fluorescence spectra of harmol, harmalol and 2-hydroxycarbazole have been obtained in concentrated aqueous potassium hydroxide solutions. The appearance of a new fluorescence band for all these compounds in media of H- greater than 16, has been ascribed to the emission of excited dianions formed by deprotonation. Acidity constants have been estimated from the Föster-Weller method.
authors.affiliation: Department of Physical Chemistry, Faculty of Pharmacy, University of Sevilla, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Hidalgo
authors.forename: C
authors.initials: C
authors.lastname: Carmona
authors.forename: M
authors.initials: M
authors.lastname: Balón
authors.forename: M A
authors.initials: MA
authors.lastname: Muñoz
mesh_terms: D002227:Carbazoles / Q000032:analysis*; D006246:Harmaline / Q000031:analogs & derivatives* / Q000032:analysis; D006247:Harmine / Q000031:analogs & derivatives* / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D006878:Hydroxides; D011188:Potassium; D017680:Potassium Compounds; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002227:Carbazoles; D006878:Hydroxides; D017680:Potassium Compounds; D012996:Solutions; C007904:harmalol; C001326:harmol; D006247:Harmine; C066713:2-hydroxycarbazole; D006246:Harmaline; D011188:Potassium; C029943:potassium hydroxide